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07-29-2020
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#1 |
 
Join Date: Nov 2016
Location: Norway
Posts: 397
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High Coast- / start up idle
I've always had periodic high idle (1500-1800 RPM) while coasting and just after start up. It did improve with the Haibeck chip, but it's still very much present. My throttle body has also been refurbished by Mark. Except of the above mentioned situations, it idles steady around 750 RPM.
Is this normal? Might it be caused by a slow/defective IAC?
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- '90 ZR-1 Last edited by S.hafsmo; 07-29-2020 at 12:38 PM. |
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07-29-2020
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#2 |
 
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Re: High Coast- / start up idle
Normal, especially for 90'. It was an emissions thing.
H 
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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07-29-2020
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#3 |
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Join Date: Nov 2016
Location: Norway
Posts: 397
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Re: High Coast- / start up idle
Well that's annoying. I was hoping something was broken.
Thanks, though.
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- '90 ZR-1 |
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07-30-2020
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#4 | |
Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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Re: High Coast- / start up idle
Quote:
Until you can stop and let the idle fall back to normal - about 3 seconds or so - idle will remain high on restart. (Takes some extra attention to technique to avoid it (accidentally stalling). Just a quirk of the 90s, it seems.)
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Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry |
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